نتایج جستجو برای: alga

تعداد نتایج: 7305  

Marine macro algae are useful to mankind as food, biofertilizer, and source of bioactive compounds such as agar-agar, alginates, and carrageenan. The aim of this study was to explore the phytochemicals, and the antibacterial activity of the marine alga Sargassum polycystem. The marine alga was subjected to ethanolic and methanolic extractions. The preliminary screening for phytochemicals showed...

Journal: رستنیها 2019

A microalgafrom Chlorarachniaceae was found in the shallow runoffs of south Tehran. Morphological and intracellular structures were studied which in accordance with the identification key (Hirakawa et al. 2011), it is found to be a new species for Iran called Amorphochlora amoebiformis (Ishida & Y. Hara) Ishida, Yabuki & S. Ota. This algahas been derived and ...

2005
James M. Willard Martin Gibbs

or ethylenediamune tetrancetate (Type I). Dark grown Euglena and Chlorella have aldolases inhibited by p-ohloromercuribenzoa.te and ethylenediamine tetraacetate but stimulated by K4 (Type II). The red alga, Chondrus, and the golden-brown alga, Ochromonas, appear to possess both types. Bean, pea, and spinach seeds and the leaves and cotyledons of etiolated bean seedlin4s oontain a p-diloromercur...

Journal: :Saline Systems 2005
Aharon Oren

A hundred years have passed since the description of the genus Dunaliella, the unicellular green alga which is responsible for most of the primary production in hypersaline environments worldwide. The present paper provides an historical survey of research on Dunaliella, from the early work in the 19th century to the thorough taxonomic studies by Teodoresco, Hamburger, Lerche and others from th...

Journal: :Science China. Materials 2021

One judiciously designed strategy of utilizing an ultrathin but conductive Ga2O3:Si nanolayer to prepare (AlGa)2O3 crystalline film is demonstrated. Benefiting from the existence nanolayer, a high-quality (Al0.68Ga0.32)2O3 sesquioxide with 68 at.% aluminum was epitaxially grown on sapphire substrates, which characterized by high-resolution transmission electron microscopy, X-ray photoelectron s...

2005
Makoto IWASHIMA Takayuki MATSUNAGA Kyoko HAYASHI Toshimitsu HAYASHI

cales) are known to contain structurally unique secondary metabolites, such as plastoquinones, chromanols, a cyclopentenone, and polysaccharides. These compounds show various biological activities due to their unique structure. We previously reported that the methanolic extract of the brown alga, Sargassum micracanthum (KUETZING) ENDLICHER, “Togemoku” in Japanese, showed strong antioxidant acti...

Journal: :Bioscience, biotechnology, and biochemistry 2002
Emi Miyamoto Fumio Watanabe Hiroyuki Takenaka Yoshihisa Nakano

The photosynthetic coccolithophoid alga, Pleurochrysis (Hymenomonas) carterae, could take up and accumulate exogenous vitamin B12, most of which was converted into the coenzyme forms of vitamin B12. Two vitamin B12-dependent enzyme activities (methylmalonyl-CoA mutase, 2.6+/-0.4 nmol/min/mg protein and methionine synthase, 85.1+/-38.9 pmol/min/mg protein) could be found in a cell homogenate of ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2003
Kaiyao Huang Christoph F Beck

Blue light as an environmental cue plays a pivotal role in controlling the progression of the sexual life cycle in the green alga Chlamydomonas reinhardtii. Phototropin was considered a prime candidate for the blue-light receptor involved. By using the RNA interference method, knockdown strains with reduced phototropin levels were isolated. Those with severely reduced levels of this photorecept...

Journal: :Journal of bacteriology 1971
C Van Baalen D S Hoare E Brandt

A unicellular blue-green alga, Agmenellum quadruplicatum, and a filamentous blue-green alga, Lyngbya lagerheimíi, were grown heterotrophically in dim light with glucose as major source of carbon and possibly energy. The dim-light conditions did not support autotrophic growth. The two blue-green algae appeared to have the same metabolic block, namely an incomplete tricarboxylic acid cycle, as ha...

Journal: :Journal of colloid and interface science 2002
Hideshi Seki Akira Suzuki

A kinetic study of cadmium and lead biosorption to a brown alga, Kjellmaniella crassiforia, was carried out. The shrinking core model derived by M. Gopala Rao and A. K. Gupta (Chem. Eng. J.24, 181, (1982)) was modified and adapted for description of the rate process of cadmium and lead biosorption to the alga. The biosorption rate process was well described and average apparent diffusion coeffi...

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